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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902b5f24f1316c44f826338e470c81ba02f786d1d612bdaf872703994ed74ae6' 
  AND token = '/Ly7jzFSeLgH0fSJ7ZZUo4OQiMaj3YolWKCI82OcO7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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