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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5303c0b970156fe15a4b05a8da16785bdae6425a7aace5caf8ae2847f7c72d0' 
  AND token = '4KBzmzT0ZU1AJumJL/Cyj1iTPJ2BEUGHSradeDzX5Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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