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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b9fc8a099e129e4d630bb2d541deb3a4f752b03a640ef2ff69dec373cfa530' 
  AND token = '/CrrbjiTALsHeEC9fOkTDN2nw61txBPDNX8zlsB+OXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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