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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775ecd3c575942a544ca71b11bbbe6e3988aa9dbbd43c30f7e6d15037d06a292' 
  AND token = 'oNXCW44xx6yhX7ZIBi/WB7rS7UExFWPLThI2pYQGKt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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