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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c207bd4a83db10279f3ed4c4c0d2411d1faf4c3916d64a9a954fec77b7dd0da3' 
  AND token = 'rPPIVwxeuwsL7Ta6YYbdJXwoJv8Bnbtd9yps4UTlc4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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