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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c870b6f37d64ab4ad8cf2c705dbb6be4fae3e00ae47983dbaa052c7ad2657207' 
  AND token = 'mon5ScoMg5EqJg77/uk6SjTv9R1I2kzVotb1k/ZqK6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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