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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477a7b1c802652e618b9c00d66c184239c71996d10966a8dd1652d23e9066ee5' 
  AND token = '8TSFEeDn4a/93cnbpzr9SYDb821NZ96i96gLCdQG2sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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