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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625fcd5e9478c07082e28b6f5bc309d4a92d4ef4ea47f3a5f45a3bba6696be8a' 
  AND token = '/miGVIpjXVb5dwT2PCWGOCzvS4PJVOj5Yk3f96XNZA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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