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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a22a4fec6ee3502fe719cb7434b0bccfc949177ca6128e9b6cc16b47750a88f' 
  AND token = '6wBIvKtb1k13b7E3kSsbeKHGOwNxpx7C1+qWG44/z/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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