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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a1eab5e0016ce06668c706cc4bcb46cc6e0e77d37bf84b613aaf670e0a563e' 
  AND token = 'A2yd5AAPNh5cDmUhbyMtwrNgeGN2aC8y9KrAX9SYsJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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