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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a645b108a39cec84a3621a0e665bc69089ba58c29083c31a56ce8bfab64c8b2' 
  AND token = 'JElSEmh+zZl4NDdNx2ifID4pXG1svDvw+N4pP/X18/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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