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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f21a6c477465b2b82b0e82210e6a679d9161ec4e2bbbcf5f2f510b362a5ec6' 
  AND token = 'gEG7vMfGO3zUVhHttnyep9c3vKocE7ZkjYholhplD1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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