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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f09a6117d1c4ddb29a00632e5cde1bf98b27966ce99cce9d1ce1813eca577f' 
  AND token = 'im4uV0tihL3BN394U+bBUai0lbwgsW24Bu/C3g52pSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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