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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0535c0ee099972e6e26323b29ffd1dadde29c4bdb6cb8e71ce40aa79da7a4c4f' 
  AND token = 'lgptUf8dWutqjs9JpDHoCH02iBEXKA1zfDshzY6Eixw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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