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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690436250481b5df3660dc3e24dc4e42cd1944ac884dc7096cdf1ec7eb3d0f2f' 
  AND token = 'REcpnMcPVT7QQhfEPk2CQUgxM/zWoDMGChk2PNjwF/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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