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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52ed3b7f3315084ea1711fbc903430b3cc96116e2b12301ce1945fd76acaf7b' 
  AND token = 'fvcSFBO5dFLohz8ej10Oe9O0eiI1HY2upmLk+6jqA4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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