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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819a17d4ee8a623036f26257f8b2da37cace3b4c26169903c61995ab09226e6f' 
  AND token = 'X3JkOpJ3TF3xtzFFWeMLC1tdPyc3s7ovn3a5pyODB3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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