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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d36ed5a38cc4e7662e198e6780a5df809975f2d11ca0a86fa627efb9f759cdd' 
  AND token = 'AOnNnD/NkvxdBudI+s+ZkgLfcQ0EMvB8LB+JK/G186U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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