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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f1ce271a7fc9821d4873a124bb59828f7e10391ba346df53302b5cf1190f83' 
  AND token = 'izoKGiXRJ4itfWWEtpzQx8zjQWc1Nzyoc6vEMmJndYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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