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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1932c602880e12a78e950b0ef564e11404776c02b62dd26cbdde69f3df4fb222' 
  AND token = '9LAyEyDntur2y6QerJn2j+DQf5PoHJHrorBADEMMcAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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