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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4dc651098274c6b26cc74f226ccffc99dd082aa3c7dd3b708797f65f1b6945' 
  AND token = 'orTD2b3BOYK815c2OBsxi7xk6HJUGXtwwp38iHgxj2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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