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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63855b99e57e39acede1c03470e60b731733e80a7dad06c0dfdf6ca6f6f86d0d' 
  AND token = 'y8jYghPeoTWAGj+fN21cGhOVzWujYNEGL0G2DajlXrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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