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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b94dd9e6b9c946551f1dd51fc2edd151e4490646ac65e478c980002a20fbdb' 
  AND token = 'ZJrb0J7Q6M8K1vyohPbC2z1K1JbW6VfJKYrLQbTfWZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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