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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a102092983177e500e667bda55fb154805055a35cae0ef3a25d2e4108f140e' 
  AND token = 'PQCRpxwXqZMqwLAwEiNK0v8NHXT3Ho874SDrH3aALfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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