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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30d658760ba0ff4a8490ebaf0636d032b8e734bdb9300a0d0d9a0f42e5be6ed' 
  AND token = 'xDTeFoNPOacqvPWX4ti6iIGkydnkb/itFkdIumd6cmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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