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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1194fd6216d806762b7119a207534c9e3e70eea79e9fafa3304e6483e9729144' 
  AND token = 'd12QJgyK18aa7IRDYmwD9B3XY3Z2pKPhRHvf5SiWcWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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