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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13b17eb692c579bf367d85370e148a88e810e29da1ea2866164cb6479c6d422' 
  AND token = '3kY4DvDbM+48nFZM/UzpM1UOebVT0ox3CvR721xdh64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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