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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573e8cd08dd8d31f7f642aa6b72a0dcb268001858bebeafefa131d9ea2d59337' 
  AND token = 'T2i7B0m556IqVC2cqqomK2bwiDFgE+9QwRoLOiyUdLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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