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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75546d241116a83d791315bd99a6aae1d9307d7793500f20eb3e9d65b5c488f1' 
  AND token = 'o0bFppM5h5w2IZR+alWPcJ5ysoLtXypK5oSADwEUO7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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