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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae387bf19efdddfacd945c184073a80cdff1a84bc3cb47f9c2c03f9e53f113a' 
  AND token = 'qlR1F4Y2ssN6pEFf2mFszNszIasiSEkUBka/7bDvXtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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