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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0d2baac5d891175da2cf8123809365c8fead50b380f1dc182ce115fbe71aac' 
  AND token = 'xtNR6gLfxVjw7ysnODEbVnU7oqUBMnmQ5ohakwkkcss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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