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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84454f35da8c3d863b68c4aa6b3e477472c7261566cca16334906e67cc1f5f5a' 
  AND token = 'NRK4WKaKBfSFWhkeZ2p1kdy+Qv7CIm4ZYnGcPJJIzwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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