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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9529fec61aaa888b2c4960b2d2c296972742558c4c8836bbfe0aa46a061851' 
  AND token = 'P3shRtqHCc3EdsNM/YUpxXnGuDsT2g6ww4BI53HPByU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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