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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887a55d9623e5c47afb3c74e6277b3e4c02b0bacbc483adbb7e75d095a3e9daf' 
  AND token = 'R+oHGan0qdpY2+9iQhu03+UY4S4+yK/1jrPj4JepzCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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