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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4835919dcffd0121342f5d80f0c8029badda30159620e1a6dd6d857c2231994b' 
  AND token = 'f3oShcSTMgio2RczVBwgrGZRW25ZRW5vvI+VryCbNOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}