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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc04cb6ecf6c80e915135f60235803b147123a8c60fa2f3b423333b132256c3' 
  AND token = 'qAAR5mZk4rnuZFG32Vm5yohaVlFfX4Yqc+KtOWfXzy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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