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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93924f18e24c1d3794d33b0d132b5c4ef2510f2f3d0f7a1273bb0fb8c4f129da' 
  AND token = 'Cc/VHj6DbDwproRxqfQPQn5ydQmZX2/SYqjMGjOSQpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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