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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7154ad5763c204d52ed567e3c535e059cd2913784990a58ce46709038225c12c' 
  AND token = '+d6CzMhA/BGSBR9DV6vCX00oZtBkQOuRe0e+31LGnBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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