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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b737a7d144930323d7f1aaa779d80d20aa126847627cc47d17e1ded6e8a95031' 
  AND token = 'biLmR5olShJovf61OZ/YVFs4//OIQoY6+bi2MmhbuBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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