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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4bce4e4175da9c44b1ad0dd560704ecbb9cc81cf19e2fc83b3f7e41a599d4d' 
  AND token = 'kZfq0kTJItueCo3g5PSwy0yowXnTVv052AykODAcg2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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