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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0aa1affeda144a50ce7b2218d07f4c4732e3deb8be6b1b26021387a1a1a311' 
  AND token = 'UjnhEQLQhqgPtuggh0l82yMfJnuxI3R9n5CSGiITbIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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