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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab54ee793928b979736bc9c385e5a131de84c52261cc8d1b2b1aaa15daebfceb' 
  AND token = 'Ps6x8TfXYecxpALRj+igP42TSp9jyI+/e5qhoRCfeD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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