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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a3abb9a3589e1798c9d5a7ac96cea48dfb60e9d04bee6d9128f9eade8221a3' 
  AND token = '6mhsWK6Q/b8Dt1gva7GvxN/ZXig6U966e8Kxn2oyV4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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