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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739712dc90626dea859009f6c8e77a2a4ec49a333d0f1c41f64545cef33cd44b' 
  AND token = 'Ec4+c9YO2FPX5eoDeuUHxx7NIeJt4Rbj5TzuayuQBeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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